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hwmon: (pmbus) Add support for MPS Multi-phase mp2888 controller

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Add support for mp2888 device from Monolithic Power Systems, Inc. (MPS)
vendor. This is a digital, multi-phase, pulse-width modulation
controller.

This device supports:
- One power rail.
- Programmable Multi-Phase up to 10 Phases.
- PWM-VID Interface
- One pages 0 for telemetry.
- Programmable pins for PMBus Address.
- Built-In EEPROM to Store Custom Configurations.
- Can configured VOUT readout in direct or VID format and allows
  setting of different formats on rails 1 and 2. For VID the following
  protocols are available: VR13 mode with 5-mV DAC; VR13 mode with
  10-mV DAC, IMVP9 mode with 5-mV DAC.

Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/20210511055619.118104-3-vadimp@nvidia.com
[groeck: Add MODULE_IMPORT_NS]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Vadim Pasternak 2021-05-11 08:56:18 +03:00 committed by Guenter Roeck
parent 0c1acde1d3
commit e4db7719d0
4 changed files with 531 additions and 0 deletions
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113
Documentation/hwmon/mp2888.rst Normal file
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@ -0,0 +1,113 @@
.. SPDX-License-Identifier: GPL-2.0
Kernel driver mp2888
====================
Supported chips:
* MPS MP12254
Prefix: 'mp2888'
Author:
Vadim Pasternak <vadimp@nvidia.com>
Description
-----------
This driver implements support for Monolithic Power Systems, Inc. (MPS)
vendor dual-loop, digital, multi-phase controller MP2888.
This device: supports:
- One power rail.
- Programmable Multi-Phase up to 10 Phases.
- PWM-VID Interface
- One pages 0 for telemetry.
- Programmable pins for PMBus Address.
- Built-In EEPROM to Store Custom Configurations.
Device complaint with:
- PMBus rev 1.3 interface.
Device supports direct format for reading output current, output voltage,
input and output power and temperature.
Device supports linear format for reading input voltage and input power.
The driver provides the next attributes for the current:
- for current out input and maximum alarm;
- for phase current: input and label.
The driver exports the following attributes via the 'sysfs' files, where:
- 'n' is number of configured phases (from 1 to 10);
- index 1 for "iout";
- indexes 2 ... 1 + n for phases.
**curr[1-{1+n}]_input**
**curr[1-{1+n}]_label**
**curr1_max**
**curr1_max_alarm**
The driver provides the next attributes for the voltage:
- for voltage in: input, low and high critical thresholds, low and high
critical alarms;
- for voltage out: input and high alarm;
The driver exports the following attributes via the 'sysfs' files, where
**in1_crit**
**in1_crit_alarm**
**in1_input**
**in1_label**
**in1_min**
**in1_min_alarm**
**in2_alarm**
**in2_input**
**in2_label**
The driver provides the next attributes for the power:
- for power in alarm and input.
- for power out: cap, cap alarm an input.
The driver exports the following attributes via the 'sysfs' files, where
- indexes 1 for "pin";
- indexes 2 for "pout";
**power1_alarm**
**power1_input**
**power1_label**
**power2_input**
**power2_label**
**power2_max**
**power2_max_alarm**
The driver provides the next attributes for the temperature:
**temp1_input**
**temp1_max**
**temp1_max_alarm**

9
drivers/hwmon/pmbus/Kconfig
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@ -249,6 +249,15 @@ config SENSORS_MAX8688
This driver can also be built as a module. If so, the module will
be called max8688.
config SENSORS_MP2888
tristate "MPS MP2888"
help
If you say yes here you get hardware monitoring support for MPS
MP2888 Digital, Multi-Phase, Pulse-Width Modulation Controller.
This driver can also be built as a module. If so, the module will
be called mp2888.
config SENSORS_MP2975
tristate "MPS MP2975"
help

1
drivers/hwmon/pmbus/Makefile
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@ -28,6 +28,7 @@ obj-$(CONFIG_SENSORS_MAX20751) += max20751.o
obj-$(CONFIG_SENSORS_MAX31785) += max31785.o
obj-$(CONFIG_SENSORS_MAX34440) += max34440.o
obj-$(CONFIG_SENSORS_MAX8688) += max8688.o
obj-$(CONFIG_SENSORS_MP2888) += mp2888.o
obj-$(CONFIG_SENSORS_MP2975) += mp2975.o
obj-$(CONFIG_SENSORS_PM6764TR) += pm6764tr.o
obj-$(CONFIG_SENSORS_PXE1610) += pxe1610.o

408
drivers/hwmon/pmbus/mp2888.c Normal file
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@ -0,0 +1,408 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Hardware monitoring driver for MPS Multi-phase Digital VR Controllers
*
* Copyright (C) 2020 Nvidia Technologies Ltd.
*/
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include "pmbus.h"
/* Vendor specific registers. */
#define MP2888_MFR_SYS_CONFIG 0x44
#define MP2888_MFR_READ_CS1_2 0x73
#define MP2888_MFR_READ_CS3_4 0x74
#define MP2888_MFR_READ_CS5_6 0x75
#define MP2888_MFR_READ_CS7_8 0x76
#define MP2888_MFR_READ_CS9_10 0x77
#define MP2888_MFR_VR_CONFIG1 0xe1
#define MP2888_TOTAL_CURRENT_RESOLUTION BIT(3)
#define MP2888_PHASE_CURRENT_RESOLUTION BIT(4)
#define MP2888_DRMOS_KCS GENMASK(2, 0)
#define MP2888_TEMP_UNIT 10
#define MP2888_MAX_PHASE 10
struct mp2888_data {
struct pmbus_driver_info info;
int total_curr_resolution;
int phase_curr_resolution;
int curr_sense_gain;
};
#define to_mp2888_data(x) container_of(x, struct mp2888_data, info)
static int mp2888_read_byte_data(struct i2c_client *client, int page, int reg)
{
switch (reg) {
case PMBUS_VOUT_MODE:
/* Enforce VOUT direct format. */
return PB_VOUT_MODE_DIRECT;
default:
return -ENODATA;
}
}
static int
mp2888_current_sense_gain_and_resolution_get(struct i2c_client *client, struct mp2888_data *data)
{
int ret;
/*
* Obtain DrMOS current sense gain of power stage from the register
* , bits 0-2. The value is selected as below:
* 00b - 5µA/A, 01b - 8.5µA/A, 10b - 9.7µA/A, 11b - 10µA/A. Other
* values are reserved.
*/
ret = i2c_smbus_read_word_data(client, MP2888_MFR_SYS_CONFIG);
if (ret < 0)
return ret;
switch (ret & MP2888_DRMOS_KCS) {
case 0:
data->curr_sense_gain = 85;
break;
case 1:
data->curr_sense_gain = 97;
break;
case 2:
data->curr_sense_gain = 100;
break;
case 3:
data->curr_sense_gain = 50;
break;
default:
return -EINVAL;
}
/*
* Obtain resolution selector for total and phase current report and protection.
* 0: original resolution; 1: half resolution (in such case phase current value should
* be doubled.
*/
data->total_curr_resolution = (ret & MP2888_TOTAL_CURRENT_RESOLUTION) >> 3;
data->phase_curr_resolution = (ret & MP2888_PHASE_CURRENT_RESOLUTION) >> 4;
return 0;
}
static int
mp2888_read_phase(struct i2c_client *client, struct mp2888_data *data, int page, int phase, u8 reg)
{
int ret;
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
if (!((phase + 1) % 2))
ret >>= 8;
ret &= 0xff;
/*
* Output value is calculated as: (READ_CSx / 80 – 1.23) / (Kcs * Rcs)
* where:
* - Kcs is the DrMOS current sense gain of power stage, which is obtained from the
* register MP2888_MFR_VR_CONFIG1, bits 13-12 with the following selection of DrMOS
* (data->curr_sense_gain):
* 00b - 5µA/A, 01b - 8.5µA/A, 10b - 9.7µA/A, 11b - 10µA/A.
* - Rcs is the internal phase current sense resistor. This parameter depends on hardware
* assembly. By default it is set to 1kΩ. In case of different assembly, user should
* scale this parameter by dividing it by Rcs.
* If phase current resolution bit is set to 1, READ_CSx value should be doubled.
* Note, that current phase sensing, providing by the device is not accurate. This is
* because sampling of current occurrence of bit weight has a big deviation, especially for
* light load.
*/
ret = DIV_ROUND_CLOSEST(ret * 100 - 9800, data->curr_sense_gain);
ret = (data->phase_curr_resolution) ? ret * 2 : ret;
/* Scale according to total current resolution. */
ret = (data->total_curr_resolution) ? ret * 8 : ret * 4;
return ret;
}
static int
mp2888_read_phases(struct i2c_client *client, struct mp2888_data *data, int page, int phase)
{
int ret;
switch (phase) {
case 0 ... 1:
ret = mp2888_read_phase(client, data, page, phase, MP2888_MFR_READ_CS1_2);
break;
case 2 ... 3:
ret = mp2888_read_phase(client, data, page, phase, MP2888_MFR_READ_CS3_4);
break;
case 4 ... 5:
ret = mp2888_read_phase(client, data, page, phase, MP2888_MFR_READ_CS5_6);
break;
case 6 ... 7:
ret = mp2888_read_phase(client, data, page, phase, MP2888_MFR_READ_CS7_8);
break;
case 8 ... 9:
ret = mp2888_read_phase(client, data, page, phase, MP2888_MFR_READ_CS9_10);
break;
default:
return -ENODATA;
}
return ret;
}
static int mp2888_read_word_data(struct i2c_client *client, int page, int phase, int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
struct mp2888_data *data = to_mp2888_data(info);
int ret;
switch (reg) {
case PMBUS_READ_VIN:
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret <= 0)
return ret;
/*
* READ_VIN requires fixup to scale it to linear11 format. Register data format
* provides 10 bits for mantissa and 6 bits for exponent. Bits 15:10 are set with
* the fixed value 111011b.
*/
ret = (ret & GENMASK(9, 0)) | ((ret & GENMASK(31, 10)) << 1);
break;
case PMBUS_OT_WARN_LIMIT:
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
/*
* Chip reports limits in degrees C, but the actual temperature in 10th of
* degrees C - scaling is needed to match both.
*/
ret *= MP2888_TEMP_UNIT;
break;
case PMBUS_READ_IOUT:
if (phase != 0xff)
return mp2888_read_phases(client, data, page, phase);
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
/*
* READ_IOUT register has unused bits 15:12 with fixed value 1110b. Clear these
* bits and scale with total current resolution. Data is provided in direct format.
*/
ret &= GENMASK(11, 0);
ret = data->total_curr_resolution ? ret * 2 : ret;
break;
case PMBUS_IOUT_OC_WARN_LIMIT:
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret &= GENMASK(9, 0);
/*
* Chip reports limits with resolution 1A or 2A, if total current resolution bit is
* set 1. Actual current is reported with 0.25A or respectively 0.5A resolution.
* Scaling is needed to match both.
*/
ret = data->total_curr_resolution ? ret * 8 : ret * 4;
break;
case PMBUS_READ_POUT:
case PMBUS_READ_PIN:
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = data->total_curr_resolution ? ret * 2 : ret;
break;
case PMBUS_POUT_OP_WARN_LIMIT:
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
/*
* Chip reports limits with resolution 1W or 2W, if total current resolution bit is
* set 1. Actual power is reported with 0.5W or 1W respectively resolution. Scaling
* is needed to match both.
*/
ret = data->total_curr_resolution ? ret * 4 : ret * 2;
break;
/*
* The below registers are not implemented by device or implemented not according to the
* spec. Skip all of them to avoid exposing non-relevant inputs to sysfs.
*/
case PMBUS_OT_FAULT_LIMIT:
case PMBUS_UT_WARN_LIMIT:
case PMBUS_UT_FAULT_LIMIT:
case PMBUS_VIN_UV_FAULT_LIMIT:
case PMBUS_VOUT_UV_WARN_LIMIT:
case PMBUS_VOUT_OV_WARN_LIMIT:
case PMBUS_VOUT_UV_FAULT_LIMIT:
case PMBUS_VOUT_OV_FAULT_LIMIT:
case PMBUS_VIN_OV_WARN_LIMIT:
case PMBUS_IOUT_OC_LV_FAULT_LIMIT:
case PMBUS_IOUT_OC_FAULT_LIMIT:
case PMBUS_POUT_MAX:
case PMBUS_IOUT_UC_FAULT_LIMIT:
case PMBUS_POUT_OP_FAULT_LIMIT:
case PMBUS_PIN_OP_WARN_LIMIT:
case PMBUS_MFR_VIN_MIN:
case PMBUS_MFR_VOUT_MIN:
case PMBUS_MFR_VIN_MAX:
case PMBUS_MFR_VOUT_MAX:
case PMBUS_MFR_IIN_MAX:
case PMBUS_MFR_IOUT_MAX:
case PMBUS_MFR_PIN_MAX:
case PMBUS_MFR_POUT_MAX:
case PMBUS_MFR_MAX_TEMP_1:
return -ENXIO;
default:
return -ENODATA;
}
return ret;
}
static int mp2888_write_word_data(struct i2c_client *client, int page, int reg, u16 word)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
struct mp2888_data *data = to_mp2888_data(info);
switch (reg) {
case PMBUS_OT_WARN_LIMIT:
word = DIV_ROUND_CLOSEST(word, MP2888_TEMP_UNIT);
/* Drop unused bits 15:8. */
word = clamp_val(word, 0, GENMASK(7, 0));
break;
case PMBUS_IOUT_OC_WARN_LIMIT:
/* Fix limit according to total curent resolution. */
word = data->total_curr_resolution ? DIV_ROUND_CLOSEST(word, 8) :
DIV_ROUND_CLOSEST(word, 4);
/* Drop unused bits 15:10. */
word = clamp_val(word, 0, GENMASK(9, 0));
break;
case PMBUS_POUT_OP_WARN_LIMIT:
/* Fix limit according to total curent resolution. */
word = data->total_curr_resolution ? DIV_ROUND_CLOSEST(word, 4) :
DIV_ROUND_CLOSEST(word, 2);
/* Drop unused bits 15:10. */
word = clamp_val(word, 0, GENMASK(9, 0));
break;
default:
return -ENODATA;
}
return pmbus_write_word_data(client, page, reg, word);
}
static int
mp2888_identify_multiphase(struct i2c_client *client, struct mp2888_data *data,
struct pmbus_driver_info *info)
{
int ret;
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
if (ret < 0)
return ret;
/* Identify multiphase number - could be from 1 to 10. */
ret = i2c_smbus_read_word_data(client, MP2888_MFR_VR_CONFIG1);
if (ret <= 0)
return ret;
info->phases[0] = ret & GENMASK(3, 0);
/*
* The device provides a total of 10 PWM pins, and can be configured to different phase
* count applications for rail.
*/
if (info->phases[0] > MP2888_MAX_PHASE)
return -EINVAL;
return 0;
}
static struct pmbus_driver_info mp2888_info = {
.pages = 1,
.format[PSC_VOLTAGE_IN] = linear,
.format[PSC_VOLTAGE_OUT] = direct,
.format[PSC_TEMPERATURE] = direct,
.format[PSC_CURRENT_IN] = linear,
.format[PSC_CURRENT_OUT] = direct,
.format[PSC_POWER] = direct,
.m[PSC_TEMPERATURE] = 1,
.R[PSC_TEMPERATURE] = 1,
.m[PSC_VOLTAGE_OUT] = 1,
.R[PSC_VOLTAGE_OUT] = 3,
.m[PSC_CURRENT_OUT] = 4,
.m[PSC_POWER] = 1,
.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_IOUT |
PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
PMBUS_PHASE_VIRTUAL,
.pfunc[0] = PMBUS_HAVE_IOUT,
.pfunc[1] = PMBUS_HAVE_IOUT,
.pfunc[2] = PMBUS_HAVE_IOUT,
.pfunc[3] = PMBUS_HAVE_IOUT,
.pfunc[4] = PMBUS_HAVE_IOUT,
.pfunc[5] = PMBUS_HAVE_IOUT,
.pfunc[6] = PMBUS_HAVE_IOUT,
.pfunc[7] = PMBUS_HAVE_IOUT,
.pfunc[8] = PMBUS_HAVE_IOUT,
.pfunc[9] = PMBUS_HAVE_IOUT,
.read_byte_data = mp2888_read_byte_data,
.read_word_data = mp2888_read_word_data,
.write_word_data = mp2888_write_word_data,
};
static int mp2888_probe(struct i2c_client *client)
{
struct pmbus_driver_info *info;
struct mp2888_data *data;
int ret;
data = devm_kzalloc(&client->dev, sizeof(struct mp2888_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
memcpy(&data->info, &mp2888_info, sizeof(*info));
info = &data->info;
/* Identify multiphase configuration. */
ret = mp2888_identify_multiphase(client, data, info);
if (ret)
return ret;
/* Obtain current sense gain of power stage and current resolution. */
ret = mp2888_current_sense_gain_and_resolution_get(client, data);
if (ret)
return ret;
return pmbus_do_probe(client, info);
}
static const struct i2c_device_id mp2888_id[] = {
{"mp2888", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, mp2888_id);
static const struct of_device_id __maybe_unused mp2888_of_match[] = {
{.compatible = "mps,mp2888"},
{}
};
MODULE_DEVICE_TABLE(of, mp2888_of_match);
static struct i2c_driver mp2888_driver = {
.driver = {
.name = "mp2888",
.of_match_table = of_match_ptr(mp2888_of_match),
},
.probe_new = mp2888_probe,
.id_table = mp2888_id,
};
module_i2c_driver(mp2888_driver);
MODULE_AUTHOR("Vadim Pasternak <vadimp@nvidia.com>");
MODULE_DESCRIPTION("PMBus driver for MPS MP2888 device");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(PMBUS);